EGR valve

how do i know if i need to replace the EGR valve?
i saw an interesting show on the speed channel and they said that after a while a car will need to have the EGR valve replaced as a tune up procedure.

so i was curious what things will show that i need to get a new EGR?

I normally would just go out and get one from kragen but they run for a lot of $$$$. so unless i need to i wont just do it.

anyone changed theirs out yet?
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